…ere the server side responds with a successful status code and a payload that does not contain any mappable attributes or relationships. We now consider this to be successful. If a mapping operation is performed that does not result in any mappings being applied, it will return NO without setting an error. If an instance of RKObjectMapper is invoked that does not find any mappable content in the payload, this will result in an unmappable content error. The object loader guards against this by not attempting to map any empty payloads. This should ensure that you only get the unmappable content error if you have asked RK to load and map a payload it cannot find an object mapping for.

…e is returned along with an empty response body. This enables the use of the status code to indicate success without any content for mapping. In these cases, we wrap the targetObject of the loader into a RKObjectMappingResult at the @"" keyPath so that the delegates are invoked as expected. closes#189